Cobalt

(Redirected from Windows 10 Cobalt)

Cobalt
Version of Microsoft Windows
Windows 10 logo and wordmark.svg
21390-desktop.png
OS familyWindows 10 (NT 10.0)
Version
Codename
Preliminary name
SemesterCobalt
Architecturex86[note 1], x64, ARM64
Latest build
Release date
Support end
Replaces
Iron
Replaced by
Nickel

Cobalt is the 21H2 development semester of Windows as a service, the commercial release of which is Windows 11. Work on Cobalt began in October 2020, although it didn't replace Iron in the Dev Channel until December. It was later followed by Nickel in the second half of 2021.

List of known builds[edit | edit source]

Wave 1 (Windows 10)[edit | edit source]

Pre-Dev Channel[edit | edit source]

Dev Channel (rs_prerelease branch)[edit | edit source]

Dev Channel (co_release branch)[edit | edit source]

Wave 2 (Windows 11)[edit | edit source]

See the list of known Windows 11 builds.

Notes[edit | edit source]

  1. Up to build 21390.